|o or O (əʊ)|
|—n , pl o's, O's, Os|
|1.||the 15th letter and fourth vowel of the modern English alphabet|
|2.||any of several speech sounds represented by this letter, in English as in code, pot, cow, move, or form|
|3.||another name for nought|
|O or O|
|2.||See universal donor a human blood type of the ABO group|
|3.||logic A E Compare I a particular negative categorial proposition, such as some men are not married: often symbolized as SoP|
|4.||slang (Austral) offence|
|[(for sense 3) from Latin (neg)o I deny]|
|1.||a variant spelling of oh|
|2.||an exclamation introducing an invocation, entreaty, wish, etc: O God!; O for the wings of a dove!|
|—n , pl ossa|
|anatomy the technical name for bone|
|[C16: from Latin: bone; compare Greek osteon]|
|—the chemical symbol for|
|2.||Old Style (method of reckoning dates)|
|4.||(in Britain) Ordnance Survey|
|6.||Old Saxon (language)|
The Greek letter omicron. Entries beginning with this character are alphabetized under omicron.
The symbol for the element oxygen.
os 1 (ŏs)
n. pl. o·ra (ôr'ə)
An opening into a hollow organ or canal.
The oral cavity; mouth.
os 2 (ŏs)
n. pl. os·sa (ŏs'ə)
The symbol for the element osmium.
Latin oculus sinister (left eye)
The symbol for oxygen.
The symbol for osmium.